Poll: Trump beats Warren, Biden in Iowa match-ups

President TrumpDonald John TrumpGOP senators balk at lengthy impeachment trial Warren goes local in race to build 2020 movement 2020 Democrats make play for veterans' votes MORE holds a slim lead in Iowa over former Vice President Joe BidenJoe BidenGOP senators balk at lengthy impeachment trial 2020 Democrats make play for veterans' votes 2020 Dems put focus on stemming veteran suicides MORE and Sen. Elizabeth WarrenElizabeth Ann WarrenWarren goes local in race to build 2020 movement 2020 Democrats make play for veterans' votes 2020 Dems put focus on stemming veteran suicides MORE (D-Mass.) in hypothetical match-ups, according to a new poll.

The survey by Emerson College found that 51 percent of registered voters said they would choose Trump over Biden. Respondents favored Trump by the same 51 percent-49 percent margin in a match-up against Warren.

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The reverse was the case for Sen. Bernie SandersBernie Sanders2020 Democrats make play for veterans' votes 2020 Dems put focus on stemming veteran suicides The Memo: Democrats confront prospect of long primary MORE (I-Vt.). Fifty-one percent of voters said they would pick him over Trump, who garnered 49 percent support.

The results of all three match-ups fell within the poll's 3.2 percentage-point margin of error.

The survey also found Warren and Biden leading the Democratic field, tied at 23 percent support among Democratic caucusgoers. South Bend, Ind., Mayor Pete ButtigiegPeter (Pete) Paul Buttigieg2020 Democrats make play for veterans' votes 2020 Dems put focus on stemming veteran suicides The Memo: Democrats confront prospect of long primary MORE was in third place with 16 percent, followed by 13 percent for Sanders.

Researchers surveyed 888 registered voters, including 317 Democratic caucusgoers, from Oct. 13-16. The Democratic caucusgoer responses have a margin of error of plus or minus 5.5. percentage points.

The Iowa caucus is scheduled for Feb. 3.